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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec8be610ef3d68a8f7aff4b47adaf9dcb8538019d6a5c053790b275dffec3a2' 
  AND token = 'VtbpX+DUaBLOX8R+F/T3YeElBctyHmf2NIByZ+eKWNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}